Chair-iron.



` e UNITED STATES 'PATENT/operon.

BERXHARD BETHKE, OF MILWAUKE, VISCONSIN, ASSIGNOR TG GILSON MANUFACTURING COMPANY, OF VISCONSIN, OF PORT 'ASHINGTON,

VISCONSIN.

' CHAIR-IRON.

No. 805,522. Specification of Letters Patent. Patented Nov. 28, 1905. Application iled December 10, 1904. Serial No. 236,273.

Tn u 10.71.0111, it may concern: i ment of either, but permitting 0f the nut be- 55 Be it known that I, BERNHARD BETHKE, ing forcibly turned by means 'of the handresiding in Milwaukee, in the county of Mil-. wheel 21 on the up er end thereof for adjustwaukee and State of \Visconsin, have inventing the elevation oi) the spindle 1S, and there- 5 ed new and useful Improvements in Chairfore of the chair-seat supported thereby.

Irons, of which the following is a description, The nut 19 is prevented from being acciden- 6o reference being had to the accompanying tally withdrawn from the hub or casting by drawings, which are apart of this specificameans of a screw 22, threaded through the tion. Y' side wall of the casting and entering an auro This invention relates to chair-irons, and nular groove 23 in the side of the nut 19.

has for its object to provide a chair-iron At its upper end the tubular spindle 1S is 65 which' will permit of a revolving recliningprovided with an enlarged head 23, with a chair having its retracting-spring housed air of outstretched arms 24, having parallel within the tubular spindle thereof. orwardly-projecting ears 25 on the ends A15' Another object of the invention is to im-l thereof, -with a pivotal pin 26 extending prove upon the construction of chair-irons in. therethrough and constituting a pivotal con- 7o general. f nection for the seat-frame. The chair-seat With the above and other objects in view frame comprises a pairof curved flanged seatthe invention consists in the devices and supporting rails 27, connected at their midzo parts and their equivalents, as hereinafter dle portions by an inverted-U-shaped sheetset forth. metal web 28, with its parallel depending side 75 Referring to the accompanying drawings, plates pivot-ally mounted on the pivot-pin 26' in which like characters of reference indicate outside of the ears 25.. the same parts in the several views, Figure 1 A yoke member 29 has its trunnion-pins z 5 is a central vertical sectional view of achair- 30 at the ends of its o)positelyextending iron embodying the present invention. Fig. arms pivotally connecte in the side plates 3oA 2 is an elevation thereof with parts in section of the web connection 2S, and at its middle looking toward the back of the chair-iron. portion it is rovided with an upwardly- Fig. is a plan view of the spindle-head with opening cup-s aped Socket 31, into which 3o the seat-frame removed. Fig. 4 is a plan loosely fits the lower end of a tubular nut 32.

view of the pivoted yoke member, and Figg' The tubular nut 32 bears upon the bottom` 8 5 is a plan view of the nut-engaging ring. of said socket and is looselv mounted in an.

In the drawings, 10 re resents the ordio ening through an overhaneing ear 33, f

nary hub or casting, provi ed with the eXtei'- which is carried by the head ot the tubularl 3 5 nal leg-engaging sockets 11 and the internal spindle 18 from the upper edge of the arms bore 12, as usual. The bore of the casting 24 and extends over the bore of said tubular 9o is countersunk at its upper end to produce s indle. The nut 32 is provided with a, 1an internal annular shoulder 13, on which s oulder to bear upon the top of the overloosely rests a ring 14, having depressions :15 hanging ear 33 and has at its upper end a 4o on its top and bottom surfaces and provided hand-wheel 34, by which it may be turned to with an inwardly-'projecting key-lug 16, adjust a bolt 35, which is threaded in the 95 which is adapted to ride in a longitudinal lower ortion thereof and which loosely groove or keyway 17 in the threaded surface slides t ough an opening in the bottom of of a tubular spindle 1S, which passes through the yoke 29 to compress a coil-spring 36 45 the ring and the bore of the hub or casting. within the bore of the tubular spindle'sur- The tubular spindle 18 is supported by a nut rounding said bolt and confined between the roo 19, which is threaded thereon and enters the head thereof and a shouldered boss 37 on the countersunk portion of the bore 12 ofthe bottom of the yoke 29. The lower endo 2, hub, bearing on the upper surface ofthe the coil-spring 36 is seated on a shouldered 5o ring 14. On its bearing-surface the nut '.119 ring 38, which is provided with an inclined E is provided with one or more rounded pro'-vv surface leading from said shoulder to fit the 10'5 jections 20, corresponding with the deprescurvature of the s ring and also has an ,up- 'vv sions 15 and ada ted to bind the ring andv wardly-projecting Iboss 39 fitting inside the nut against acci. ental independent movecoil-spring. The ring 38 hasaattened bot-A Alimited by the enga-gement of the yoke 2S) tom surface to bear upon the head of the' bolt l 35 and is prevented from turning on said bolt i by fitting on a squared portion of the boltshank.

From the foregoing it will be seen that the f chair-seat frame may be iivotally swung i upon the pivotal pin 26 wit-liin the limits of the movement-s of the yoke 29 between the g head of the tubular spindle 1S and the overlianging ear 33 and that this extent of movement of the chair-seat frame is positively with these obstructions in its path. Furyy ther, as the downward movement of the yoke 29 causes the coil-spring 36 to be compressed such downward movement of the yoke, which takes place with't-he backward nioveinent of the chair-seat frame, is cushioned by the spring, and the degree of this cushioning effect may be varied by the adjustment of the bolt by means of the hand-wheel 34 on nut 32, so as to increase or diminish the initial compression of the coil-spring 36.

It will be noted that the trimmen-bearings of the yoke 29 enable it to remain in its proper relation toward the immovable bolt 35, as it slides up and down on seid bolt, due l to the tilting of the chair-seat frame, and consequently no binding between these parts l can occur. The telescoping lit between the walls of the socket 31 and the lower end of the tubular nut 32 serves as a guide for the yoke 29 toassist it in keeping its upright position during its oscillations while the chairseat frame is being tilted upon the pivotal pin 26. The coil-*spring 36, bearing at its ends against the lug on the boss 37 and the shoulder on the ring 38, which is keyed to the bolt 35 by being fitted on the squared ortion thereof, prevents the bolt from turnmg as the nut 32 is being tightened, and thereby assures a ready adjustment of the compression of the spring.

The vertical adjustment of the chair-seat is accomplished by the turning of the nut 19 on the tubular spindle 1S by means of the hand-wheel 21, the nut being then forced to ride its projections 20 over the depressions 15 of the ring 14, which does not turn inde endent of the chair-seat because of its eing keyed to the tubular spindle 1S. When, however, the desired vertical adjustment is attained, the turning of the chair-seat will not disturb such adjustment, inasmuch as the nut 19 is forced to rot-ate with the tubular spindle 18, on which itis threaded, bythe engagement of these projections 20 on the bottom of the nut with the depressions 15 of the ring 14, which is loose wit-bin the counteisunk portion of the bore of hub 10 and supoi'ts the weight of the chair-seat upon the shoulder 13 of said hub.

It is obvious that-many of the details of construction here shown and described are not essential to the efficient operation'of the tubular-spindle-housed retracting-spring, but that many variations and modifications may -be madein these details without departing from the spirit and scope of this invention.

It is apparent that the tilting feature of the chair-iron here shown and described is not in any way limited in its application to a revolving chair, but might equally well be applied to a. non-revolving chair. in which a tubular stem or support might replace the tubular spindle 17, and as insuch event the stem or support would be the full equivalent of the spin le for the purposes of this invention such equivalent.c are intended to be cornpreliended by the term tubular spindle and its substitutes as employed in the claims.

'Yhat l claim as my invention is- 1. In a. chair-iron, a suitably-mounted tubular spindle, a head thereon, a chair-seat frame pivoted to the head, and a spring located within tlie tubular spindle and having connection with the head and with the chairseat frame. i

2. In a chair-iron, a suitably-mounted tubular spindle, a head thereon, a chair-seat frame pivoted to the head and positively limited in its movements by the head, and a spring contained within the tubular spindle and having connection with the head and the chair-seat frame. t

3. In a chair-iron, a tubular stein, a head Vthereon having projecting ears, a chair-seat frame pivoted to the ears, a s )ring supported within the tubular stein, an a yoke carried by the chair-seat frame and bearing on the springA Il. [n a chair-iron, a hollow stem, a head thereon, a. chair-seat frame pivoted to the head, an ear on the head overhanging the hollow of the stein, a yoke pivoted to the chair-seat frame and adapted to have a move- IOf) nient between the overhanging ear and the head, a bolt attached to the overhanging ear and passing through the yoke and into the hollow of the stem, and a coil-spring within the hollow of the stem and confined between the head of the bolt and the yoke.

5. In a chair-iron, a tubular spindle, a head thereon, aHcliair-seat frame pivfrted to the head, an overhanfring ear on the head, a yoke carried by the c lair-seat frame, a bolt passing through the yoke and entering the tubular spindle, a nut on the overhaiigiiig ear threaded to the bolt and adapted to adjust said bolt, and a coil-spring surrounding the bolt and bearing on the bolt-head and on the Toke.

5 6. In` a chair-iron, a tubular spindle, a head thereon, a chair-seat frame ivoted to the head, an overhanging ear on t e head, a yoke pivoted to the chair-seat frame, a nut seated in an :ipening et the overhanging ear and bearing in a socket of the yoke, a bolt passing through the yoke and threaded to the nut, 'and a coil-spring on the bolt within IIO the tubular spindle bearing on the head of the bolt and on the yoke.

Vlimited in its movements by engagement with the head and the overhanging ear, a tubular nut having a hand Wheel thereon seated through an opening in the overhanging ear and bearing in a socket of the Voke, a

' bolt passing through the yoke and threaded to the nut, a shouldered ring keyed on the )rovided with a central boss, a shoulderei boss on the oke, and a coilspring surrounding the bolt within the tubular spindle and bearing at one end against.

` the shoulder of the ring and at the other end against the shoulder of the yoke with the bosses entering its ends.

S. In a ohalr-iron, a tubular splndle, a

i Vhead on the end thereof, a pair of oppositelys l l extending arms on said head, parallel forwardly-extendm ears on the arms, a pivotal pin connecting t- 1e ears, a chair-seat frame `comprising a pan' of chair-supporting rails 'with a oonnectlng U-shaped web having 1ts parallel side plates pivoted to the pivotal pin, an overhanging ear on the head, a yoke pivoted at its ends in the side plates of the chairseat frame and having an upwardly-opening socket at its middle portion, a should ered nut seated in an opening of the overhanging ear and provided with a hand-Wheel on its upper end and bearing at its lower end in the Vsocket of the yokey a bolt passing through the yoke and threaded in the nut, and a collsprinff within the tubular spindlesurrounding t 1e bolt and bearing on the bolt-head and on the yoke.

9. In a chair-iron, aA tubular stem, a ehairseat frame pivotally mounted on the tubular stem, and va compression-spring located in the tubular stem, said chair-seat frame being adapted to bear upon the Acompressionspring.

10. In a chair-iron, a tubular stem, a head thereon having projecting ears, a chair-seat frame pivoted to the ears, a spring supported within the. tubular stem, and a yoke pivotally mounted on the chair-seat frame and bearing on the spring.

l 1 In a chair-iron, a tubular stem, a chairseat frame pivoi'ally mounted on the tubular stem, a coil compression-s ring adjustably mounted Within the tubu ar stem, and a member pivotally mounted on the chair-seat frame and bearing on the c ompression-spring.

12. In a chaudron, a suitably-mounted tubular spindle, a head thereon, a chair-seat frame pivoted to the head, a compressionspring located Within the tubular spindle and having adjustable connection with t-he head, and means carried. by the chair-seat frame bearing on the compression-spring.

13. In a chair-iron, a suitably-mounted tubular spindle, a head thereon, a chair-seat frame 'pivoted to the head, a compressionspring located within the tubular spindle, means for adjustably connecting one end of the spring with the head, and means pivotally mounted on the chair-seat frame and bearing on the other end of the compressionspring.

In testimony whereof I affix my signature in presence of two Witnesses.

BERNHARD -BETHKE Witnesses C. T. BENEDICT, ANNA F. ScmuDTBAUER. 

